diff --git a/src/ClaudeDo.Data/Repositories/TaskRepository.cs b/src/ClaudeDo.Data/Repositories/TaskRepository.cs
index a3709a0..8796e39 100644
--- a/src/ClaudeDo.Data/Repositories/TaskRepository.cs
+++ b/src/ClaudeDo.Data/Repositories/TaskRepository.cs
@@ -346,6 +346,37 @@ public sealed class TaskRepository
         return count;
     }
 
+    public async Task<bool> DiscardPlanningAsync(
+        string parentId,
+        CancellationToken ct = default)
+    {
+        using var tx = await _context.Database.BeginTransactionAsync(ct);
+
+        var parent = await _context.Tasks
+            .AsNoTracking()
+            .FirstOrDefaultAsync(t => t.Id == parentId, ct);
+        if (parent is null || parent.Status != TaskStatus.Planning)
+        {
+            await tx.RollbackAsync(ct);
+            return false;
+        }
+
+        await _context.Tasks
+            .Where(t => t.ParentTaskId == parentId && t.Status == TaskStatus.Draft)
+            .ExecuteDeleteAsync(ct);
+
+        await _context.Tasks
+            .Where(t => t.Id == parentId)
+            .ExecuteUpdateAsync(s => s
+                .SetProperty(t => t.Status, TaskStatus.Manual)
+                .SetProperty(t => t.PlanningSessionId, (string?)null)
+                .SetProperty(t => t.PlanningSessionToken, (string?)null)
+                .SetProperty(t => t.PlanningFinalizedAt, (DateTime?)null), ct);
+
+        await tx.CommitAsync(ct);
+        return true;
+    }
+
     #endregion
 
     #region Queue selection
diff --git a/tests/ClaudeDo.Worker.Tests/Repositories/TaskRepositoryPlanningTests.cs b/tests/ClaudeDo.Worker.Tests/Repositories/TaskRepositoryPlanningTests.cs
index 612015b..648b97a 100644
--- a/tests/ClaudeDo.Worker.Tests/Repositories/TaskRepositoryPlanningTests.cs
+++ b/tests/ClaudeDo.Worker.Tests/Repositories/TaskRepositoryPlanningTests.cs
@@ -246,4 +246,40 @@ public sealed class TaskRepositoryPlanningTests : IDisposable
         var cLoaded = await _tasks.GetByIdAsync(c.Id);
         Assert.Equal(TaskStatus.Queued, cLoaded!.Status);
     }
+
+    [Fact]
+    public async Task DiscardPlanningAsync_DeletesDraftsAndResetsParent()
+    {
+        var listId = await CreateListAsync();
+        var parent = MakeTask(listId, TaskStatus.Manual);
+        await _tasks.AddAsync(parent);
+        await _tasks.SetPlanningStartedAsync(parent.Id, "tok");
+        await _tasks.UpdatePlanningSessionIdAsync(parent.Id, "claude-42");
+        var c1 = await _tasks.CreateChildAsync(parent.Id, "c1", null, null, null);
+        var c2 = await _tasks.CreateChildAsync(parent.Id, "c2", null, null, null);
+
+        var ok = await _tasks.DiscardPlanningAsync(parent.Id);
+
+        Assert.True(ok);
+        Assert.Null(await _tasks.GetByIdAsync(c1.Id));
+        Assert.Null(await _tasks.GetByIdAsync(c2.Id));
+
+        var parentLoaded = await _tasks.GetByIdAsync(parent.Id);
+        Assert.Equal(TaskStatus.Manual, parentLoaded!.Status);
+        Assert.Null(parentLoaded.PlanningSessionId);
+        Assert.Null(parentLoaded.PlanningSessionToken);
+        Assert.Null(parentLoaded.PlanningFinalizedAt);
+    }
+
+    [Fact]
+    public async Task DiscardPlanningAsync_OnNonPlanningTask_ReturnsFalse()
+    {
+        var listId = await CreateListAsync();
+        var task = MakeTask(listId, TaskStatus.Manual);
+        await _tasks.AddAsync(task);
+
+        var ok = await _tasks.DiscardPlanningAsync(task.Id);
+
+        Assert.False(ok);
+    }
 }